hi, one of zestriddle's admins here.
first of all, the current address of the game is
ze?t online riddle... and it should never expire.
be sure to visit the official zest's forum -
Board Message - with plenty of hints in the level threads. we also have a now-busy IRC channel, #zest_online_riddle at QuakeNet.org, which you may access with this client -
QuakeNet Web IRC (qwebirc)
i encourage you to visit our IRC channel frequently, since it's the best way to get super fast hints you need to solve the riddles. also, not any less important, you can just hang out with us

don't feel disappointed if it's empty for some time, i can assure you it has traffic now and experienced riddlers visit it.
i probably won't show up here anymore, i'm just fulfilling my mission of revitalising zest riddle, but feel free to send me a private message in the forum mentioned above or query me at IRC if you have questions. also, sorry for being a thread necromancer.
see you there